import java.util.Scanner;
import java.math.BigInteger;
public class Main {
public static void main(String[] args) {
int n,f,i,j=1;
BigInteger b,sum;
Scanner input=new Scanner(System.in);
while(input.hasNext())
{
n=input.nextInt();
f=input.nextInt();
if(n==0 && f==0)
{
break;
}
sum=BigInteger.valueOf(0);
for(i=1;i<=n;i++)
{
b=input.nextBigInteger();
sum=sum.add(b);
}
System.out.println("Bill #"+(j++)+ " costs " +sum+": each friend should pay "+(sum.divide(BigInteger.valueOf(f))));
System.out.println();
}
}
}
import java.math.BigInteger;
public class Main {
public static void main(String[] args) {
int n,f,i,j=1;
BigInteger b,sum;
Scanner input=new Scanner(System.in);
while(input.hasNext())
{
n=input.nextInt();
f=input.nextInt();
if(n==0 && f==0)
{
break;
}
sum=BigInteger.valueOf(0);
for(i=1;i<=n;i++)
{
b=input.nextBigInteger();
sum=sum.add(b);
}
System.out.println("Bill #"+(j++)+ " costs " +sum+": each friend should pay "+(sum.divide(BigInteger.valueOf(f))));
System.out.println();
}
}
}
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